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I take it to mean that sometimes you have lots of energy coming in (during daylight for example), then suddenly very little (during nighttime). Weather can affect it also.

So to balance the supply of electricity to customers you need a way to make sure there is an not too much and not too little.

Many years ago in Britain, it was predictable that at the end of the TV show Eastenders, people would all go to turn on their kettle for Tea. The surge was so big that someone had to monitor when the programme ended and initiate the additional supply of electricity to meet demand. That supply even had electricity from France as a backup.

I recall an interview where they had that energy available from a Hydroelectric Power Station where they could release the water and get an instant source of electricity.

All for tea.

[1] https://www.forbes.com/sites/quora/2017/09/06/britain-turned...

[2] https://www.geek.com/geek-cetera/tea-time-in-britain-causes-...

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